Solid as a rock
Very solid or dependable.The small bank in our city is as solid as a rock and is a very stabe organization.
Sold out
A product or ticket is completely sold from a store or event.All of the latest DVD's are sold out at the moment.
Soil one’s diapers
A baby fills his or her diapers.The baby soiled his diapers on the airplane trip.
Soften up (someone) soften (someone) up
To weaken one's opposition.The boxer tried hard to soften up his opponent.
Soft spot for (someone or something)
A feeling of affection toward a person or thing.My mother has a soft spot for the elderly lady in her apartment building.
Sock (something) away sock away (something)
To store something in a safe place, to save something.I have been socking money away for my holidays.
Sock it to (someone)
To do everything that one is capable of doing.The president socked it to the audience during his speech at the convention.
Sob story
A story that makes one feel pity or sorrow.My sister told me a sob story about how she had lost her job.
Soaked to the skin
One's clothing is wet right through to the skin.We were soaked to the skin when we got home from the picnic.
Slap (something) together slap together (something)
To make something in a hurry and without care.We slapped together a picnic table for the company picnic.